​Just a few minutes after knifing through the defense like it was hot butter, ​Niners RB Raheem Mostert's night took a ​significant turn for the worse. A late third quarter drive ended with Mostert's arm being completely mangled, forcing him to leave the game.

​​In a blowout win, no less. Absolutely awful.

The kid posted a 50+-yard TD earlier in the contest, too, and must have been enjoying rolling down the field with Nick Mullens at the helm. Now, he may not make it to the second game of the Mullens Era, nursing this absolutely nasty twist. Stay tuned for more information on Mostert in the postgame scrum.